單項選擇題The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.
A.SOS
B.XXX
C.TTT
D.PAN
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1.單項選擇題Which of the following indicates a grave and imminent danger requesting immediate assistance on radio telephone?（）.
A.SOS
B.Mayday
C.Securite
D.PAN
2.單項選擇題Which one of the following is the safety signal?（）.
A.SSS
B.TTT
C.XXX
D.FFF
3.單項選擇題Your vessel has been damaged and is taking on water，but you do not require immediate assistance. You would preface a message advising other vessels of your situation with（）.
A.Mayday-Mayday-Mayday
B.Pan-Pan (3 times)
C.Securite-Securite-Securite
D.SOS-SOS-SOS
4.單項選擇題The urgency signal concerning the illness of persons on board ship is（）.
A.MAYDAY
B.PAN
C.SECURITE
D.ATTENTION
5.單項選擇題If you wished to transmit a message by voice concerning the safety of navigation，you would preface it by the word（）.
A.Mayday
B.Pan-pan
C.Securite
D.Safety
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